A former official in Rudy Giuliani‘s administration, who recently finished a four-year federal prison stint, has launched a blog about his ex-boss – including an allegation the former mayor used his position to get then-girlfriend Judith Nathan a cut-rate apartment.

Russell Harding, a son of Liberal Party Chairman Ray Harding, blogs on http://www.rudyveritas.com that Giuliani’s top lieutenant, Anthony Carbonetti, contacted him about getting the pad in 1999.

Harding – then head of the Housing Development Corp. – said he was “shocked,” but hooked Nathan up with Related Corp., which was bidding for city business. A Giuliani spokeswoman produced a letter she said Harding sent Carbonetti last year, in which Harding said he’d turned down repeated book offers “at potentially very considerable expense” for information about Giuliani, his wife, and several City Hall players. He said he was broke and wondered if Carbonetti had “any plans to help me.”

She said the charges were false and “the letter makes all too clear Russell’s motivations.”